condition mean min max ZT0-3 818.539749 818.539749 818.539749 ZT4-7 921.2342140000001 921.2342140000001 921.2342140000001 ZT8-11 1155.7750735 1155.7750735 1155.7750735 ZT12-15 1095.545257 1095.545257 1095.545257 ZT16-19 787.7075649999999 787.7075649999999 787.7075649999999 ZT20-23 663.4833205 663.4833205 663.4833205